Equilibrium Modeling and Kinetics for Removal of Manganese Ions by Organic Modifying Zeolite
Zeolite in some regions or countries of the word have been the subjects of materials for envi ronmental remediation involving the use of removal to heavy metal ions and some organic pollutant as a sorbent because of its capacious ions exchange and huge surface area.Establishing a successful mathematic model is significant to predict adsorptive behavior of pollutant.Sorption isothermal equilibrium and kinetics have been widely used to describe the heavy metal adsorptive characteristics in sorbent.This article addresses the equilibrium and kinetics for manganese adsorption using zeolite modified by hexadecyl trimethyl ammonium bromide (HTMAB) as a sorbent material over a range of pH between 3.4～7.2 with eight different Mn (Ⅱ) solution concentrations.PHzpc (pH of zero point charge) of the sorbent was examined according to the method proposed by Tripathy and Kanungo,and a value of 6.91 was obtained.The experimental data fit langmuirs model for the majority of pH and Mn (Ⅱ) solution concentrations tested (0.92＜R2＜0.97).The maximal adsorption capacity,qm ascending with pH between 3.4～7.2,rise from 15.01mg·g-1 at 3.4 to 19.46 mg·g-1 at 7.2.Besides,the constant of Freundlich Kfhave the same trend with qm,increases with pH ascending.And the sorption intensity,represented by parameter 1/n in Freundlichs model,is favorable in entire range of metal ions concentration studied.Finally,kinetics data accurately fit to pseudo-second order which indicate that there must be sorption of Mn(Ⅱ) behavior occurring on inner-sphere of the sorbent.
Adsorption Equilibrium model Kinetics Langmuirs model Fruendlichs model Manganese Modified zeolite
L.W.Luo H.X.Xiang
Resource and environment department of Hunan agricultural university,Changsha,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3357-3363
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）